Fix typos in documentation

Feedback-theme-spec-0.0.0.md

@@ -40,7 +40,7 @@ With the above a feedback theme in YAML format could look like:
 full:
     - event-name: phone-incoming-call
       type: Sound
-      effect: phone-incoing-call
+      effect: phone-incoming-call
     - event-name: message-new-sms
     ...
 quiet:

README.md

@@ -215,4 +215,3 @@ GSETTINGS_SCHEMA_DIR=_build/data/ gsettings set org.sigxcpu.feedbackd.applicatio
 
 [debian/control]: ./debian/control#L5
 [1]: https://source.puri.sm/Librem5/feedbackd-device-themes)
-

doc/feedbackd.xml

@@ -38,7 +38,7 @@
 </para>
 <para>
   The feedback triggered by a given event is determined by the feedback
-  them in use. Events are submitted via a DBus API. For details
+  theme in use. Events are submitted via a DBus API. For details
   refer to the event and feedback theme specs at
   <ulink url="https://source.puri.sm/Librem5/feedbackd/"/>
 </para>